Nowadays, it’s a perspective more than anything else. In a system involving more than one computer, the server is the machine where the files come from amd the main software runs, while the client is where the user sits amd controls what the server does. A server might have many clients at once (as is common in Websites), and the same machine might be both a client and the server (this was once common in multiplayer games like Doom and Quake, but it is less common nowadays).
Any computer that has access to a network can be a server, including PCs. It’s possible to buy computers that are geared more toward server work. These tend to focus more on storage, networking, and number of CPU cores, amd their cases are meant to be stored with other hardware in equipment racks. PCs, on the other hand, tend these days to focus more on GPU prowess, peripheral connectivity, and the cases are stored on or under a desk. But either type of machine can be a server when needed.
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